package yuscii

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yuscii
- Yuscii
  - String

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type 'a folder =
  'a ->
  int ->
  [ `Malformed of string | `Uchar of Uchar.t ] ->
  'a

The type for character folder. The integer is the index in the string where the `Uchar or `Malformed starts.

val fold : ?off:int -> ?len:int -> 'a folder -> 'a -> string -> 'a

fold e ?off ?len f a s is f ( ... (f (f a pos u₀) j₁u₁) ... ) ... ) j_n u_n where u_i, j_i are characters and their start position in the e encoded substring s starting at pos and len long. The default value for pos is 0 and len is String.length s - pos.